POSIVA OY Olkiluoto FI-27160 EURAJOKI, FINLAND Tel +358-2-8372 31 Fax +358-2-8372 3709 Pirjo Hellä, ed. Antti Ikonen Jussi Mattila Taija Torvela Liisa Wikström April 2009 Working Report 2009-29 RSC-Programme - Interim Report Approach and Basis for RSC Development, Layout Determining Features and Preliminary Criteria for Tunnel and Deposition Hole Scale